Permit this girl to carry a whip (7)
I believe the answer is:
leather
'whip' is the definition.
(I've seen this before)
'permit this girl to carry a' is the wordplay.
'permit' becomes 'let' (synonyms).
'this girl' becomes 'her' ('her' refers to a girl or woman).
'to carry' means one lot of letters goes inside another.
'let'+'her'='lether'
'lether' enclosing 'a' is 'LEATHER'.
(Other definitions for leather that I've seen before include "Flog; hide" , "Treated animal skin" , "Beat" , "Tanned animal hide" , "Morocco, perhaps" .)